Progress so far has been very good．We are,    __, confident that the work will be completed as expected．

—Must I turn off the gas after cooking?—Of course.You can never be ________ careful with that.

A short, thin man, __ past middle age, visited the manager and applied for the job.

As is known to all language learners, the newly learnt words will soon be forgotten unless they are _______ used in everyday communication.

Life is stressful, and complaining may be considered by many as an extension of being________normal.